Synonyms: 17,18-Seco-20a-yohimban-16-carboxylic acid,16,17-didehydro-17-methoxy-, methyl ester, (E)- (8CI); Corynan-16-carboxylicacid, 16,17-didehydro-17-methoxy-, methyl ester, (16E,20b)-; Corynantheidine (6CI,7CI);(-)-Corynantheidine; Epidihydrocorynantheine; Indolo[2,3-a]quinolizine-2-aceticacid, 3-ethyl-1,2,3,4,6,7,12,12b-octahydro-a-(methoxymethylene)-, methyl ester, [2S-[2a(E),3a,12bb]]-